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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b5dd09c2ccf01db084570706a5fabcf465498e11e1707f89fa900f7c350b89d9' 
  AND token = 'b8IEQLLM9HLMwvL27hjtjUsT0CSnM1nEAXJ9KaPUf94=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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