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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '13919b82acb4babe3ee4c5bb98208732a74c96defd9126c2221cea1799eb9b8b' 
  AND token = 'ospMOh8FwbdaiDZUKwMsl/tytrnC10uj8C8PB7M/mVg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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