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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '11b1a576ae74bb3fe122e0a456b3124098a2ff66cbb6ed0c3fad9f946a0da446' 
  AND token = '//6+M7ynxeJa5oF+G8d7UAC+Vrwg8L4UQFJRV8Rd2xU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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