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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b481982bc258d8d6d093f0e5761e724e5e2b22ff1b56b470e7be2c45ec44e9d7' 
  AND token = 'rpZRRJF6Z6cI8VEHwWk7pKqHxxNl3A3XAhH0rhnqJcg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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