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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '292041e03eefd62457318ce579668a47dc9b3db6bafb8e81463e4eb4fcb9e52e' 
  AND token = 'XSHRnTw23ImXGs9AntCzvpey4HIE2M7AB351lJCco3E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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