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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b120363d3a124a6b85a22b9a84b45497c0de9f64b9c5740463891a35171c0cda' 
  AND token = '3vFPpT9A+USekGSFv+4LxStov3tnR+W9LGjyWYMgHIM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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