SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '94c887b07426fb3f1715de24b856bef61a56e47e0b6359d7d8fdacb96073f2db' 
  AND token = 'qp2IDLOCQj1jHgHEqU29E4gjDER5Fq8tlppiYBwUeGQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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