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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '409421effa219d1c1a8b01fd89833779fdd7cabbc0679c3d3fcc168a4185f27f' 
  AND token = 'bq2hWiRiEgv6OvHYxaixUfU/z78XfVaa/yl37Ubp+fI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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