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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd001d6beeb1503753e3aa1164908b3b6bc33b1e71f42174afde11512e467a5e0' 
  AND token = 'MrCDf8iroMqRzSzpA4sbvNyoHtKLJEUuDy671mC1M6s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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