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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5701dc512b874c6c88b988262a90b1c52c886d5d5a5082ed71610fc1a40d682c' 
  AND token = '2JHPaBemcyS4ovZBnGIMP6P5Cfd3mFBOjB+Gld/o9Kg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}