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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'eba19f7f4faebe06139a048e131760bdd1c8e59b60190d26ed793d7d69a94abb' 
  AND token = 'kdGFQ5KkC/AfI87BaReHDc2eFRqoUOVBH1IxZInA8/Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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