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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6626164c5c07e7d0b72bc06ae3ace5078db05030c607b6211181331261437b4d' 
  AND token = 'UWFlz3pVla9kWHWWYlMhooa2GRWM+hw8zJ4xW37JHOo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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