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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5eaf73f55735947ccd0777c2cd7b784b17bcfd0d359196e9890b5bf2db1a5d6b' 
  AND token = 'QbC/seXt5VKNwmSbSexPjsQx+vegOBZ16tDrEq/bkZI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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