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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '902a4527f83b2370a8c649fa388dcebcd73f41138b6f50342ebca2ffcdaa46ac' 
  AND token = 'OU5jKsxbuZ4lwo/yJfap12ZIFv25ltA2QAdToAz5uyQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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