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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8b2334e37deaeff491fdef3950cf2f3547ddbcc321446772adb12c3718baa419' 
  AND token = 'LAJET8xipLuiRLCmwdnHaFZ/YUKZ2JzNfSueAZIOAJE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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