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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '990ee809daf96871555fd1503b312d59560e60710bac8b2105ccae4ec2dff796' 
  AND token = 'R09GVcwesl0njOEcu/TGmVAFeM1SSqJqv86DpiZyMlA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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