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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '027dbecbc74d2c402f23f11e8c31d43fd3d92da7ef3fc272ac77a6e0d4f7c2c0' 
  AND token = 'TAYFgfuV0vq9qGgpkUNwuZJdAPlveEG5jUlIONdX/lQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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