SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f2045a41b09db94e734dba9525c80bac6784fd640dab2bfaa8f6e75be67bde98' 
  AND token = 'IVUOqNl5pdzgLKFEwKU7FQ0J4GFlHY9Gae+AYC/8tdc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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