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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '42b5c96d74377ef82bd6e3ce0cbba42b830e08054e304faa2cb0046c76ee59dd' 
  AND token = 'aBp1nPUc6WXmf3y8T+a7pvv98a6JYYFUEYJHZAJ+/fw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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