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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0a7c0f4c6a042bb0835d711d5e5eb3b671c01632438a0d14ac2018f229ae7a71' 
  AND token = 'C3blxAf7eRIDOdSU3/0J6bTyc/xdvWUULKBEkXdkd7A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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