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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7d8cab26d598f8ce98320d2eb228e564ae8c0318633f27c6573c291af6c96126' 
  AND token = '5H6FOwdbUTBeV00wCAiV0kc9fiExboxstdZAO6me61o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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