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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'eed3494f1964c6a98727d6e88a8b434ab54112d92dcc4a0fc7bb17233be9336a' 
  AND token = 'yx8A3/JtI6/47kK2fX6Irf141aJDlRKByk6NJBR2zbk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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