SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '928c18273b05f80904cfa27374657240c251a89a95951a904e90e43eea7d8a4d' 
  AND token = 'vHIFDjrXqocX08RGtsE1MArKPxJ145IZM+5hg3jSOVs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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