SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '562ac4a98b6f34b3df7fc9c26c8385ff42203eedda2e0dbb380419147d653986' 
  AND token = 'pgCQ7zj2yhZIAuMkLVdOp67Bel+lzGR/RnYLeQcvdSk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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