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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6ee448f28fb7b5a9ac262c6c54451a7cc7bde685d753a15d7ceb664e2ca76eef' 
  AND token = 'QBUiQCDL3e4WQ2rNJf7yBCe58p/hbLq4ffSa53g/k/M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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