SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fbe810a9bdd7cadd868f5a974f5a66575e28b7b48c4eab102e2a38228ff716a4' 
  AND token = 'GiQ/7w0+FA2CC3P1qzJuzZpTl8FDP0OhhakemMIiCvI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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