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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e039e3d1cc567f69d801e0daddd08787551ac4fb56ffda6800f3c27b1a4b7633' 
  AND token = 'FmXEYSpXZmn0LQTJr8S3c5U5pmFFEqtGthGrdP4Oz5I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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