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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6b720af6ee307b06c6cef30cef90fdab30c80db1fc0af52f14465ce46bea2b0e' 
  AND token = '6LwFuaR4ZyDD4diBXhsvJRbKaqoUA0Lo+Aiv40pwdg0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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