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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8d439dc1a67ea079774e94259d44992d6aebc2e396486b38abb72c738ee724b2' 
  AND token = '1JJxiWTGUb4KfDga5lcxsUH5JEmgmqqW6d585W/3iwA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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