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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6fba02d703768e60a4a324ce20681d94fdcbd27c07b3b3d5cc9c8f88dea9e442' 
  AND token = 'P/wdvU4qT554Lxvv4UeLPHk/5gNNAPpGpkTFFVh4bS8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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