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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4eba33f7a285ef7866ec04b6aa261924d32949cbffc32c91f64ae7617cd03f56' 
  AND token = 'MPrUrWCl8r1hVuZmEyThRyC7PC0i6I5cPzNZ5tQ9JQ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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