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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '58efc722068584301f569c3e29febb22aec303a4e74af276e2ddce758adbfb2a' 
  AND token = 'tD3slyznjuOrZG0zhYMe9dwgYEyNUWvpaxx9W8COjGw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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