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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'acccf6ccd1ea9f4372595ca21f82024b9de8c8b1348bbfe93b40ac0f9d5129ce' 
  AND token = '6qknMdADXMCbFyZpNxVRvbane18WsqFS2tfmteaYnoY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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