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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'aec1b56b7fe4f29c0aa2ab804c15c2d803c9c53b4c4f0719fe0b2ef9d4575925' 
  AND token = 'qwQnEHp7N2RxRpJgKoF2qm3r004XS+XxVVX5m4MMNk8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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