SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '067eed3a5f68d27306eb51247a95f369cfcfbf18599fda1c0975bd178a0f7a5d' 
  AND token = 'h4CJNCb1PO11FCH2Ywlv40khS0gp+BIRmqS2VocggIU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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