SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f4ec64326fc11ba5ef98d654052767ad9b17fad03327bac6b1185b687d53765e' 
  AND token = 'HykIuvvhlW+jJJvv0Wv77Mn0WdAsNQuIofKwU3S/nNs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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