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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9e1cdb1c56ceb0fc9367016711a75ed4ad8f545b62ef309cbbaa1e799489d35f' 
  AND token = 'kp4V+8dNp5CZTWSEojcYbTO3L88Qh99HfUMwpsV4jLA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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