SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4945a2882bf9a2f207728e20e9bda1365838122029418ba276638d451f75fad9' 
  AND token = '4Wti8aJUiXbzjqtOuRBZGAjUYEnfNw+la8HDw5X2chA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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