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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'dce4050c45f9f1da30d81f30e60e875de9173687bb524f7de85fe1ebc4a42eb8' 
  AND token = 'KETzFkk9aqk2HVas/amN+APwK2v4BWQmuctF0FRy8Cw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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