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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '85d58ac2ca26310544a508b360b217eff8feab14f254615e75e7da7eb576bc91' 
  AND token = 'Ww7z8ADBgveyP4/iUgd7nNgf5RZbksLP5U1PQ9ffCSI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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