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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fcdd7c21771ece47ee4ed492aa71299b29e77e39d0cf9863b598176a155d7a9a' 
  AND token = 'aWiuouFSFEEk6vsdj5hpGaC9pRnHzAhBgQBJUCTmKis=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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