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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c9c33f2bfb99e5bb08c08efa04b41c80e8df57819994d6ec3efc88efb670bf52' 
  AND token = 'NTtrLwX2esIsccPvTydw7CnMJNEYphzA8JkZbDKL0rE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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