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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a239c145cdd348ebbe148824ae3d4a0a6833b63de0099ce4ac4eb1c36cef4ca9' 
  AND token = 'sYde+LSVI16eRBLNm5aDDVcvpjX0oZ5QGQ0V2vmF4Ko=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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