SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '36d38b386fc1a9986d536a1b61a1ef608444d244eecbecdb207c0fe3787418cc' 
  AND token = 'oV5BfVDrV+/uRM2BlZkYSYGA2IPJNNTp6WU7VI6zlNQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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