SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '201d09b6bd4fba91b8589e883e0dd40b7796ebd63e0190ac44cf4a45c1b55222' 
  AND token = 'v+UbeL0YQnLqUwAPKTGV2nU3GYuswXXzgSXQfZG4EB4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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