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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0565ba5fd83b24b67a46546a10fd9f4af52587a7ec7ee456edcdca3d96a54c58' 
  AND token = 'idFmeIf2A/yij42pZADW7TtNbfdMGC0PZieEY9iTJis=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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