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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9a301a4a2f2f28f6c62966de88f09e13e83d469a3e8da62ab1ba8d650ccaedf4' 
  AND token = 'Q3i9y1NiEduM6ILFUrASGKlOZRhwLE3l5kQHcIx6tgA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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