SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0e1c416f01c0217d0ab35f7260f76e19d6b0904d98328382c8576a4912f374fc' 
  AND token = 'Hk7VCkgCAPb4epAzStjNnEWSn9gi6XqHxGsTwhqCXsc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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