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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0da9e435d0204ebfee79da95ce8583f25ab1a8c6bf6966f1f2e8f35a57a4e0ee' 
  AND token = 'fOj/Ld1fpXsEL6dh4HW0RAcQe1a23KixTZcARf05cr0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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