SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '916adc9fbadf15b3489c63de494ebe137ee2501385f4a039b2f62963700fb37f' 
  AND token = 'gDzVPU/O6njE2x/HcbaeT2fpn9Dm6nm4fBzPVrwqNXY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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