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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f1c1cc54ed25582d142316a1fdd52afdaad84c4532aefa975ffe6d89be77d4eb' 
  AND token = 'bFWBAsURiPT6lows+bDb6ijZwEwitZuII8f4Ag3q+5o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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