SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a3d5a26e3285d2562504b988ffff51f87d66780a613a27f1013b898dc269b635' 
  AND token = '+0bpPjI1n7pPoBaX+RRLiY749DUIEjOqTUmlg6sGGdg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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