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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0311b9a531c87a69d041b6788fc5433212d996ad3b33109c7034d2a7dd0e00d8' 
  AND token = 'xL21CuYTkpbaCotZjgZdE6vCF0fWAyxS5dc0digd6YE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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