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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cd56deef3abe4dc6661b95e4cbde33c03613444a784e85dcf0724fb7e9dab63d' 
  AND token = 'tr3K2JaCzFcsoCbctlfkzeVj2Zns/wXTThGnQFZjHGc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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