SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7f36974fbb45ff5629981e77b3ca7d0a16eeb3bfb374534a285f1f8f2d85bc1a' 
  AND token = '9fWGLyz9zJGWBgdoKVjkSUqWQgYC31Sj14mhMT1hxn4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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