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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'aa4486105c23981a3c03f6cdb56688d3640f327723cc5fbc1a938bc9de2c1cf4' 
  AND token = '9KuebcoB45trzhg/nuBSSTW4HB59iqO6pmnTF4tZF1Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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