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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c0b56dcd7695a9737e785016027934d2011c28b91cd73f801e8ec69012bcbe7c' 
  AND token = 'aQsDoywDuMV262sFHN2VfqpxOpQN2mUBCIYuMBoLSe4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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