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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '85e3c5e02295558fa6efa48938e33b36b9efcf50e3429346c2c9ec9fa3436ed8' 
  AND token = 'oTxwusp2/pENykwNgxo64dpX4sIJyLGxd3hzlT62Nvk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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